Compton DAQ Dev

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Project to Develop a DAQ for the Compton

Here are some notes on the project of developing the Compton counting mode DAQ. The original work was done mainly by Bryan Moffit and Ben Raydo in 2020, with input from others.

It is foreseen to be a precurser of a moller polarimeter DAQ as well as a counting-mode DAQ for the MOLLER project, etc.

See earlier work https://hallaweb.jlab.org/wiki/index.php/Compton_Counting_DAQ_Software_HOWTO

Budget and Plan

          Budget and Plan

 Upgrade of Compton and moller polarimeter DAQ in halls A and C.

 The 4 systems are approximately the same.  The FADC will be modified
 to support both counting mode and integrating mode.  

 Item      Price each      Qty       Line cost

 VXS crate   16.5 k        4         66 k
 VTP         10 k          4         40 k
 cpu (ATOM)   3 k          4         12 k
 SD           2 k          4          8 k
 scaler       4 k          4         16 k
 VETROC       2 k          8         16 k
 TI           2 k          4          8 k
 I/O          1.5 k        4          6 k
 Spares                              43 k
 ==========================================
 TOTAL                              215 k$
 
This plan was approved in Aug 2022.  It's essentially 43k$ per
DAQ (times 5 since we need spares).  We'll buy the first system
for the hall C moller in FY2023.  This 43k$ is in the FY2023 budget.
After that we may need to refine the design.  Then in FY2024 we'll
purchase/build 3 more DAQs.  Finally, buy spares in FY2025.

Current Test Setup

updated R. Michaels Oct 12, 2022

Here is a picture https://hallaweb.jlab.org/wiki/index.php/File:Polarimeter_daq_xfig.pdf

The basic configuration of the DAQ

DAQ config: https://hallaweb.jlab.org/wiki/index.php/File:HaVTP_config.png

ROC1 : https://hallaweb.jlab.org/wiki/index.php/File:Roc1_config.png

VTP : https://hallaweb.jlab.org/wiki/index.php/File:VtpROC_config.png

How to Run the Current Setup

This is a VXS crate located in the TEDF building cubicle 11. The crate is at the top of the rack. The crate was formerly installed in hall A during PREX/CREX. 

updated Oct 12, 2022.  R. Michaels

How to login to the two ROCs and start the ROC

ssh -X amoll1 -l sbs-onl
./startroc1

ssh -X havtp1 -l sbs-onl
./startRoc

How to start CODA on atedf3.  Username adaq.

kcoda

startcoda

VTP readout
havtp1:/home/sbs-onl/comptonDaq/vtp/rol/vtp_list.so
ROC1 readout
amoll1:/home/sbs-onl/comptonDaq/rol/vtpCompton_list.so

Oct 12, 2022.
Currently using a 50 Hz front-panel pulser trigger on TI.
Later want to modify this to use a trigger from VTP based on data
from FADC and/or the VETROC.

If I drop the VTP from the readout and remove tiRocEnable(2)
from amoll1:/home/sbs-onl/comptonDaq/rol/vtpCompton_list.c
then the DAQ runs fine and both the FADC and VETROC data
make sense.

Next I added the VTP.  Still a FP trigger.  It downloads
and prestarts. But here is where the problems start.

Current Problems

Oct 12, 2022.  R. Michaels

Problematic symptoms:

I don't get any events.  Actually I get a burst of events on ROC1
but the VTP seems to be stuck.

VTP complains a lot:  VTP_output.txt

Some notable errors
vtpInit: VTP_FW_Version=0x10004, VTP_FW_Type=19
vtpInit: ERROR - unknown firmware type 19. Unable to setup VTP PLL.
vtpSerdesCheckLinks: ERROR - all serdes links not up!
daLogMsg: ERROR: VTP Serdes links not up
(I set it up to temporarily ignore that and try to get events)
vtpSetCompton_EnableScalerReadout: ERROR: VTP wrong firmware type (15
when the run ends, the VTP segfaults
./startRoc: line 4:  1755 Segmentation fault      coda_roc -i -s $SESSION -n vtpROC -t ROC

---------------------------------------------------------------------------------

Detailed printout from VTP https://hallaweb.jlab.org/wiki/index.php/File:VTP_output.txt

Analysis Software

Nothing here yet. Work in progress. But there was software for the DAQ used during PREX/CREX.

Old Results

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